Liquid filter



FIG. 1 is a top side elevational view of the liquid filter thereof.

FIG. 2 is a bottom side elevational view of the liquid filter thereof.

FIG. 3 is a right elevational view of the liquid filter thereof.

FIG. 4 is a left elevational view of the liquid filter thereof.

FIG. 5 is a front view of the liquid filter thereof; and,

FIG. 6 is a rear view of the liquid filter thereof. 

I claim the ornamental design for a liquid filter, as shown and described. 